org.eclipse.linuxtools.lttng2.kernel.core.tests/src/org/eclipse/linuxtools/lttng2/kernel/core/tests/headless/BasicStateSystemExample.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Mathieu Denis <mathieu.denis@polymtl.ca> - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.linuxtools.lttng2.kernel.core.tests.headless;
  14
  15 import java.io.File;
  16 import java.util.List;
  17
  18 import org.eclipse.linuxtools.internal.lttng2.kernel.core.Attributes;
  19 import org.eclipse.linuxtools.internal.lttng2.kernel.core.stateprovider.CtfKernelStateInput;
  20 import org.eclipse.linuxtools.lttng2.kernel.core.tests.stateprovider.CtfTestFiles;
  21 import org.eclipse.linuxtools.tmf.core.exceptions.AttributeNotFoundException;
  22 import org.eclipse.linuxtools.tmf.core.exceptions.StateValueTypeException;
  23 import org.eclipse.linuxtools.tmf.core.exceptions.TimeRangeException;
  24 import org.eclipse.linuxtools.tmf.core.exceptions.TmfTraceException;
  25 import org.eclipse.linuxtools.tmf.core.interval.ITmfStateInterval;
  26 import org.eclipse.linuxtools.tmf.core.statesystem.IStateChangeInput;
  27 import org.eclipse.linuxtools.tmf.core.statesystem.ITmfStateSystem;
  28 import org.eclipse.linuxtools.tmf.core.statesystem.StateSystemManager;
  29
  30 /**
  31  * Simple example of how to use the state system using a CTF kernel trace.
  32  *
  33  * @author Mathieu Denis
  34  */
  35 public class BasicStateSystemExample {
  36
  37     /**
  38      * Run the program
  39      * @param args Arguments on the command-line
  40      */
  41     public static void main(String[] args) {
  42         /* Read a trace and build the state system */
  43         try {
  44             File newStateFile = new File("/tmp/helloworldctf.ht"); //$NON-NLS-1$
  45             IStateChangeInput input = new CtfKernelStateInput(CtfTestFiles.getTestTrace());
  46             ITmfStateSystem ss = StateSystemManager.loadStateHistory(newStateFile, input, true);
  47
  48             requestExample(ss);
  49         } catch (TmfTraceException e) {
  50             e.printStackTrace();
  51         }
  52     }
  53
  54     /**
  55      * From a state system tree previously built with a CTF kernel trace, print
  56      * to the console the interval of each state and the ID of the current
  57      * thread running on each CPU.
  58      *
  59      * @param ssb
  60      *            the State System Builder through which make request
  61      */
  62     private static void requestExample(final ITmfStateSystem ssb) {
  63         try {
  64             /* Request the current thread executing on each CPU */
  65             List<Integer> currentThreadByCPUS;
  66             List<ITmfStateInterval> stateIntervals;
  67             StringBuilder output = new StringBuilder();
  68
  69             currentThreadByCPUS = ssb.getQuarks(Attributes.CPUS, "*", Attributes.CURRENT_THREAD); //$NON-NLS-1$
  70
  71             for (Integer currentThread : currentThreadByCPUS) {
  72                 stateIntervals = ssb.queryHistoryRange(currentThread.intValue(), ssb.getStartTime(),
  73                         ssb.getCurrentEndTime());
  74
  75                 /* Output formatting */
  76                 output.append("Value of attribute : "); //$NON-NLS-1$
  77                 output.append(ssb.getFullAttributePath(currentThread.intValue()));
  78                 output.append("\n------------------------------------------------\n"); //$NON-NLS-1$
  79                 for (ITmfStateInterval stateInterval : stateIntervals) {
  80                     /* Print the interval */
  81                     output.append('[');
  82                     output.append(String.valueOf(stateInterval.getStartTime()));
  83                     output.append(", "); //$NON-NLS-1$
  84                     output.append(String.valueOf(stateInterval.getEndTime()));
  85                     output.append(']');
  86                     /* Print the attribute value */
  87                     output.append(" = "); //$NON-NLS-1$
  88                     output.append(stateInterval.getStateValue().unboxInt());
  89                     output.append('\n');
  90                 }
  91             }
  92             System.out.println(output.toString());
  93         } catch (TimeRangeException e) {
  94             e.printStackTrace();
  95         } catch (AttributeNotFoundException e) {
  96             e.printStackTrace();
  97         } catch (StateValueTypeException e) {
  98             e.printStackTrace();
  99         }
 100     }
 101 }